U.S. Olympic hopeful David Boudia (L), Carl Lewis, and Nastia Liukin smile as they take selfies on the observation deck of the Empire State Building to celebrate 100 days until the 2016 Olympic Games, in New York, U.S., April 27, 2016. REUTERS/Lucas Jackson 

U.S. Olympic hopeful David Boudia (L), Carl Lewis, and Nastia Liukin smile as they take selfies on the observation deck of the Empire State Building to celebrate 100 days until the 2016 Olympic Games, in New York, U.S., April 27, 2016. REUTERS/Lucas Jackson 

Former Olympic athlete Nastia Liukin fixes her hair before posing for photographs on the observation deck of the Empire State Building to celebrate 100 days until the 2016 Olympic Games, in New York, U.S., April 27, 2016. REUTERS/Lucas Jackson 

Former Olympic athlete Nastia Liukin smiles after turning on the lights of the Empire State Building to celebrate 100 days until the 2016 Olympic Games, in New York, U.S., April 27, 2016. REUTERS/Lucas Jackson 

Athletes (L-R) Carl Lewis, Nastia Liukin, and U.S. Olympic hopeful David Boudia smile as they stand on the observation deck of the Empire State Building to celebrate 100 days until the 2016 Olympic Games, in New York, U.S., April 27, 2016. REUTERS/Lucas Jackson 

Athletes (L-R) Carl Lewis, Nastia Liukin, and U.S. Olympic hopeful David Boudia smile as they flip the switch to turn on the lights on top of the Empire State Building in New York, U.S., April 27, 2016. REUTERS/Lucas Jackson 

Olympic gymnast Nastia Liukin poses at the 2014 Nickelodeon Kids' Choice Sports awards in Los Angeles July 17, 2014. REUTERS/Danny Moloshok (UNITED STATES - Tags: ENTERTAINMENT SPORT GYMNASTICS OLYMPICS) 

Olympic gymnast Nastia Liukin poses at the 2014 Nickelodeon Kids' Choice Sports awards in Los Angeles July 17, 2014. REUTERS/Danny Moloshok (UNITED STATES - Tags: ENTERTAINMENT SPORT GYMNASTICS OLYMPICS) 

Olympic gymnast Nastia Liukin poses at the 2014 Nickelodeon Kids' Choice Sports awards in Los Angeles July 17, 2014. REUTERS/Danny Moloshok (UNITED STATES - Tags: ENTERTAINMENT SPORT GYMNASTICS OLYMPICS) 

U.S. gymnast Nastia Liukin performs on the balance beam at the U.S. Olympic gymnastics trials in San Jose, California July 1, 2012. REUTERS/Mike Blake (UNITED STATES - Tags: SPORT GYMNASTICS OLYMPICS) 

Nastia Liukin, the 2008 Olympic women's all-round gold medallist in gymnastics, waves to the crowd after competing at the U.S. Olympic gymnastics trials in San Jose, California July 1, 2012. REUTERS/Mike Blake (UNITED STATES - Tags: SPORT GYMNASTICS OLYMPICS) 

U.S. gymnast Nastia Liukin performs on the uneven bars at the U.S. Olympic gymnastics trials in San Jose, California June 29, 2012. REUTERS/Mike Blake (UNITED STATES - Tags: SPORT GYMNASTICS OLYMPICS) 

U.S. gymnast Nastia Liukin falls on the uneven bars at the U.S. Olympic gymnastics trials in San Jose, California June 29, 2012. REUTERS/Mike Blake (UNITED STATES - Tags: SPORT GYMNASTICS OLYMPICS) 

Gymnast Nastia Liukin poses for a portrait during the 2012 U.S. Olympic Team Media Summit in Dallas, Texas May 14, 2012. Olympic all-around gymnastics champion Liukin is relishing the exhaustion of intense training in her rushed bid to represent the United States at the London Games. The 22-year-old will compete for the first time in three years at the U.S. Classic in Chicago in less than two weeks, but is battling to hose down expectations even as her anticipation grows. To match OLY-GYMN-GAWIAA-LIUKIN/CAMP REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT OLYMPICS PROFILE PORTRAIT GYMNASTICS HEADSHOT) 

Gymnast Nastia Liukin poses for a portrait during the 2012 U.S. Olympic Team Media Summit in Dallas, Texas May 14, 2012. Olympic all-around gymnastics champion Liukin is relishing the exhaustion of intense training in her rushed bid to represent the United States at the London Games. The 22-year-old will compete for the first time in three years at the U.S. Classic in Chicago in less than two weeks, but is battling to hose down expectations even as her anticipation grows. To match OLY-GYMN-GAWIAA-LIUKIN/CAMP REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT OLYMPICS PROFILE PORTRAIT GYMNASTICS) 

Gymnast Nastia Liukin poses for a portrait during the 2012 U.S. Olympic Team Media Summit in Dallas, Texas May 14, 2012. Olympic all-around gymnastics champion Liukin is relishing the exhaustion of intense training in her rushed bid to represent the United States at the London Games. The 22-year-old will compete for the first time in three years at the U.S. Classic in Chicago in less than two weeks, but is battling to hose down expectations even as her anticipation grows. To match OLY-GYMN-GAWIAA-LIUKIN/CAMP REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT OLYMPICS PROFILE PORTRAIT GYMNASTICS TPX IMAGES OF THE DAY) 

Olympic gold medalist gymnast Nastia Liukin of the U.S. poses for a photograph at the Gymnastics World Championships in London October 13, 2009. Liukin was daddy's special girl a year ago but now needs an appointment to see her busy father Valery. The 19-year-old's decision to take a break after winning gold in Beijing last August means she has been exiled from the inner-sanctum of American gymnastics, at least temporarily. REUTERS/Toby Melville (BRITAIN SPORT GYMNASTICS) 

Olympic gold medalist gymnast Nastia Liukin of the U.S. poses for a photograph at the Gymnastics World Championships in London October 13, 2009. Liukin was daddy's special girl a year ago but now needs an appointment to see her busy father Valery. The 19-year-old's decision to take a break after winning gold in Beijing last August means she has been exiled from the inner-sanctum of American gymnastics, at least temporarily. REUTERS/Toby Melville (BRITAIN SPORT GYMNASTICS) 

Nastia Liukin smiles during an awards presentation at the conclusion of the Senior Women's competition at the 2009 Visa Championships in Dallas, Texas August 15, 2009. REUTERS/Jessica Rinaldi (UNITED STATES SPORT GYMNASTICS) 

Nastia Liukin (R) poses for a photo with her father and coach Valeri Liukin (L) during an awards ceremony at the 2009 Visa Championships in Dallas, Texas August 15, 2009. REUTERS/Jessica Rinaldi (UNITED STATES SPORT GYMNASTICS) 

Nastia Liukin competes on the balance beam during the final round of the Senior Women's competition at the 2009 Visa Championships in Dallas, Texas August 15, 2009. REUTERS/Jessica Rinaldi (UNITED STATES SPORT GYMNASTICS) 

Members of the United States 2009 Women's National team (Top row, L-R) Kayla Williams, Jana Bieger, MacKenzie Caquatto, Kytra Hunter, Rebecca Bross, Ivana Hong, Bridget Sloan. (Bottom Row L-R) Mattie Larson, Samantha Shapiro, Chellsie Memmel, Samantha Peszek, Nastia Liukin, Kaitlyn Clark, Alaina Johnson, and Cassandra Whitcomb pose for a portrait at the 2009 Visa Championships in Dallas, Texas August 15, 2009. REUTERS/Jessica Rinaldi (UNITED STATES SPORT GYMNASTICS) 

Nastia Liukin smiles during the first round of the Senior Women's competition at the 2009 Visa Championships in Dallas, Texas August 13, 2009. REUTERS/Jessica Rinaldi (UNITED STATES SPORT GYMNASTICS) 

Nastia Liukin competes on the beam during the first round of the Senior Women's competition at the 2009 Visa Championships in Dallas, Texas August 13, 2009. REUTERS/Jessica Rinaldi (UNITED STATES SPORT GYMNASTICS) 

Nastia Liukin competes on the beam during the first round of the Senior Women's competition at the 2009 Visa Championships in Dallas, Texas August 13, 2009. REUTERS/Jessica Rinaldi (UNITED STATES SPORT GYMNASTICS) 

Gymnast Nastia Liukin poses baskstage after winning the Best Female Athlete award during taping of the 2009 ESPY Awards in Los Angeles July 15, 2009. The awards show will be telecast on ESPN July 19. REUTERS/Danny Moloshok (UNITED STATES ENTERTAINMENT SPORT) 

Gymnast Nastia Liukin receives the Best Female Athlete award during the taping of the 2009 ESPY Awards in Los Angeles July 15, 2009. The awards show will be telecast on ESPN July 19. REUTERS/Mario Anzuoni (UNITED STATES ENTERTAINMENT SPORT) 

Former U.S. Secretary of State Condoleezza Rice presents Best Female Athlete to gymnast Nastia Liukin during taping of the 2009 ESPY Awards in Los Angeles July 15, 2009. The awards show will be telecast on ESPN July 19. REUTERS/Mario Anzuoni (UNITED STATES ENTERTAINMENT SPORT) 

Swimmer Amanda Beard (L) and gymnast Nastia Liukin attend the Badgley Mischka Spring 2009 show at New York Fashion Week September 12, 2008. REUTERS/Joshua Lott (UNITED STATES) 

U.S. swimmer Amanda Beard (L) and gymnast Nastia Liukin attend the Badgley Mischka Spring 2009 collection at New York Fashion Week September 12, 2008. REUTERS/Joshua Lott (UNITED STATES) 

Olympic gymnast Nastia Liukin of the U.S. (L) and swimmer Ryan Lochte of the U.S. watch the Max Azria Spring 2009 show during New York Fashion Week September 9, 2008. REUTERS/Lucas Jackson (UNITED STATES) 

Olympic gymnast Nastia Liukin of the U.S. smiles backstage before the Max Azria Spring 2009 show during New York Fashion Week September 9, 2008. REUTERS/Lucas Jackson (UNITED STATES) 

Nastia Liukin of the U.S. performs on the balance beam during an artistic gymnastics gala at the Beijing 2008 Olympic Games August 20, 2008. REUTERS/Reinhard Krause (CHINA)

Nastia Liukin of the U.S. performs on the balance beam during an artistic gymnastics gala at the Beijing 2008 Olympic Games August 20, 2008. REUTERS/Ceerwan Aziz (CHINA)

Gymnastics champion Nastia Liukin of the U.S, poses with the five medals she won in the Beijing 2008 Olympic Games, August 20, 2008. REUTERS/Nir Elias (CHINA) 

Gymnastics champion Nastia Liukin of the U.S, poses with the five medals she won in the Beijing 2008 Olympic Games, August 20, 2008. REUTERS/Nir Elias (CHINA) 

Gymnastics champion Nastia Liukin of the U.S, poses in front of a Chinese pavilion with the five medals she won in the Beijing 2008 Olympic Games, August 20, 2008. REUTERS/Nir Elias (CHINA) 

Gymnastics champion Nastia Liukin of the U.S, poses in front of a Chinese pavilion with her five medals she won in the Beijing 2008 Olympic Games, August 20, 2008. REUTERS/Nir Elias (CHINA) 

Gymnastics champion Nastia Liukin of the U.S, poses in front of a Chinese pavilion with new five medals she won in the Beijing 2008 Olympic Games, August 20, 2008. REUTERS/Nir Elias (CHINA) 

(L-R) Silver medallist Nastia Liukin of the U.S., gold medallist Shawn Johnson of the U.S. and bronze medallist Cheng Fei of China pose during the medal presentation ceremony for the gymnastics women's beam final at the Beijing 2008 Olympic Games August 19, 2008. REUTERS/Reinhard Krause (CHINA) 

(L-R) Silver medallist Nastia Liukin of the U.S., gold medallist Shawn Johnson of the U.S. and bronze medallist Cheng Fei of China pose during the medal presentation ceremony for the gymnastics women's beam final at the Beijing 2008 Olympic Games August 19, 2008. REUTERS/Hans Deryk (CHINA) 

Silver medallist Nastia Liukin of the U.S. poses during the medal presentation ceremony for the gymnastics women's beam final at the Beijing 2008 Olympic Games August 19, 2008. REUTERS/Hans Deryk (CHINA)

Gold medallist Shawn Johnson (411) of the U.S. hugs compatriot silver medallist Nastia Liukin during the gymnastics women's beam final at the Beijing 2008 Olympic Games August 19, 2008. REUTERS/Hans Deryk (CHINA) 

Gold medallist Shawn Johnson (L) of the U.S. hugs compatriot silver medallist Nastia Liukin during the gymnastics women's beam final at the Beijing 2008 Olympic Games August 19, 2008. REUTERS/Hans Deryk (CHINA) 

Bronze medallist Cheng Fei (R) of China looks at silver medallist Nastia Liukin of the U.S. and gold medallist Shawn Johnson of the U.S. during the medal presentation ceremony for the gymnastics women's beam final at the Beijing 2008 Olympic Games August 19, 2008. REUTERS/Alessandro Bianchi (CHINA) 

(L-R) Silver medallist Nastia Liukin of the U.S., gold medallist Shawn Johnson of the U.S. and bronze medallist Cheng Fei of China pose during the medal presentation ceremony for the gymnastics women's beam final at the Beijing 2008 Olympic Games August 19, 2008. REUTERS/Alessandro Bianchi (CHINA) 

Gold medallist Shawn Johnson (R) of the U.S. hugs compatriot silver medallist Nastia Liukin during the medal presentation ceremony for the gymnastics women's beam final at the Beijing 2008 Olympic Games August 19, 2008. REUTERS/Alessandro Bianchi (CHINA) 

Nastia Liukin of the U.S. competes in the gymnastics women's beam final at the Beijing 2008 Olympic Games August 19, 2008. REUTERS/Alessandro Bianchi (CHINA) 

Nastia Liukin of the U.S. competes in the gymnastics women's beam final at the Beijing 2008 Olympic Games August 19, 2008. REUTERS/Alessandro Bianchi (CHINA) 

Silver medallist Nastia Liukin of the U.S. poses on the poduim during the medal presentation ceremony for the women's uneven bars final in the artistic gymnastics competition at the Beijing 2008 Olympic Games August 18, 2008. REUTERS/Alessandro Bianchi (CHINA) 

Nastia Liukin of the U.S. holds her silver medal on the podium during the medal presentation ceremony for the women's uneven bars final in the artistic gymnastics competition at the Beijing 2008 Olympic Games August 18, 2008. REUTERS/Hans Deryk (CHINA)

(L-R) Silver medallist Nastia Liukin of the U.S., gold medallist He Kexin of China and bronze medallist Yang Yilin of China pose during the medal presentation ceremony for the women's uneven bars final during the artistic gymnastics competition at the Beijing 2008 Olympic Games August 18, 2008. REUTERS/Hans Deryk (CHINA) 

(L-R) Silver medallist Nastia Liukin of the U.S., gold medallist He Kexin of China and bronze medallist Yang Yilin of China attend the medal presentation ceremony for the women's uneven bars final during the artistic gymnastics competition at the Beijing 2008 Olympic Games August 18, 2008. REUTERS/Alessandro Bianchi (CHINA) 

(L-R) Silver medallist Nastia Liukin of the U.S., gold medallist He Kexin of China and bronze medallist Yang Yilin of China attend the medal presentation ceremony for the women's uneven bars final during the artistic gymnastics competition at the Beijing 2008 Olympic Games August 18, 2008. REUTERS/Alessandro Bianchi (CHINA) 

He Kexin (C) of China waves as she is led out for the medal presentation ceremony for the women's uneven bars final during the artistic gymnastics competition at the Beijing 2008 Olympic Games August 18, 2008. Nastia Liukin of the U.S. follows. REUTERS/Hans Deryk (CHINA) 

Gold medallist He Kexin (L) of China kisses silver medallist Nastia Liukin of the U.S. during the medal presentation ceremony for the women's uneven bars final during the artistic gymnastics competition at the Beijing 2008 Olympic Games August 18, 2008. REUTERS/Alessandro Bianchi (CHINA) 

Gold medallist He Kexin of China (C), silver medallist Nastia Liukin of the U.S. (L) and bronze medallist Yang Yilin of China hold their medals on the poduim during the medal presentation ceremony for the women's uneven bars final in the artistic gymnastics competition at the Beijing 2008 Olympic Games August 18, 2008. REUTERS/Reinhard Krause (CHINA)

Nastia Liukin of the U.S. competes in the women's uneven bars final during the artistic gymnastics competition at the Beijing 2008 Olympic Games August 18, 2008. REUTERS/Hans Deryk (CHINA)

Nastia Liukin of the U.S. competes in the women's uneven bars final during the artistic gymnastics competition at the Beijing 2008 Olympic Games August 18, 2008. REUTERS/Hans Deryk (CHINA)

(L-R) Bronze medallist Nastia Liukin of the U.S., gold medalalist Sandra Izbasa of Romania and silver medallist Shawn Johnson of the U.S. pose during the medal presentation ceremony for the gymnastics women's floor exercise final at the Beijing 2008 Olympic Games August 17, 2008. REUTERS/Hannibal Hanschke (CHINA)